The most recent release I know of is a few of them getting ported to the Wii, but those were quickly stopped doe to an illegal use of ScummVM. There was also a completely original Freddi Fish release for the DS, and Freddi Fish 1 and Putt-Putt Saves the Zoo recently got iOS ports.
I think I've seen a box of Putt Putt, Spyfox, or something else recently in a store. It was a PC version and I swear it's been in the last 2 years or so.
Yeah, Humongous as an entity hasn't vanished. They still sell their stuff (and I think they're cool with the ScummVM team - regardless of the Wii situation, which neither of them had a hand in).
Anyway, they're now owned by Atari, so who knows? Maybe they'll show up here one day.